Paper feeding module and scanning device using the same

Abstract

A paper feeding module including a first shaft, a first ring-shape structure, a paper picking roller and a paper feeding roller is provided. The first shaft has a first stopping block. The first ring-shape structure rotatably covers the first shaft and has a second stopping block and a third stopping block, wherein the first shaft drives the first ring-shape structure to rotate while the second stopping block is pushed by the first stopping block. The paper picking roller rotatably covers the first shaft and is located on the paper feeding path, and has a fourth stopping block, wherein the first ring-shape structure drives the paper picking roller to rotate while the fourth stopping block is pushed by the third stopping block. The paper feeding roller is disposed on the paper feeding path.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 98125091, filed on Jul. 24, 2009. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a paper feeding module and a scanning device using the same. More particularly, the present invention relates to a paper feeding module having rollers, and a scanning device using the same.[0004]2. Description of Related Art[0005]Recently, with a booming development of computer technology, and as price of a scanning device goes down due to a strong market competition, the scanning device becomes a popular computer peripheral in the market.[0006]The scanning devices can be grouped into different types according to prices or functions thereof. In detail, the scanning devices are grouped into a handheld ...

AI Technical Summary

Benefits of technology

[0007]The present invention is directed to a paper feeding module, which can improve scanning quality of a scanning device.

[0008]The present invention is directed to a scanning device, which has a better scanning quality.

[0015]In the present invention, the first shaft can drive a paper to move towards the paper feeding roller while the first ring-shape structure drives the paper picking roller to rotate. When the paper simultaneously contacts the paper picking roller and the paper feeding roller, the paper feeding roller with a relatively high rotating speed (compared to that of the first shaft) can dive the fourth stopping block of the paper picking roller to divorce from the third stopping block of the first ring-shape structure through the paper, so that the paper picking roller and the paper feeding roller may have a same tangential speed. Therefore, a problem that the paper is pulled by the paper picking roller and the paper feeding roller due to different tangential speeds of the paper picking roller and the paper feeding roller can be avoided, so that a moving speed of the paper is stable, and accordingly the scanning quality is improved.

Problems solved by technology

However, since a rotating speed of the paper feeding roller is generally faster than that of the paper picking roller, the paper is pulled by the paper feeding roller and the paper picking roller, so that at a moment when the paper is divorced from the paper picking roller, a moving speed thereof is unstable, and accordingly a scanning quality is influenced.

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